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(No Model.)

J. H. THORP; ARTIFICIAL STONE.

Patented May 29,1883.

N. PHERS. Phewutho nalur. wamingxm D, C.

Nrr ED STATES PATENT ARTIFICIAL STONE.

SPECIFICATION forming part of Letters Patent No. 278,671, dated May 29,1883.

Application filed October as, 1852. (No model.)

To all whom it may concern:

Be it known that I, JAMES H. THORP, of Baltimore, in the county ofBaltimore and in the State of Maryland, have invented certain new anduseful Improvements in Artifical Stone; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to letters of referencemarked IO thereon, making a part of this specification.

This invention relates to an improved plastic compound or pozzolana tobe employed for various architectural purposes, paving, and other likeuses; audit has for its objects to provide a composition that willpossess, when set and hardened, great strength and durability, and whichwill be capable of effectually resisting the action of moisture, frost,and heat.

My invention consists essentially in a compound composed of thefollowing ingredients, viz: kaolin, plaster-of-paris, soapstone, jute,caustic alkali, litharge, green copperas, carbolic acid, liquorammonite, and dextrine or 2 5 other gummy substance. These materials maybe employed in proportions varying with the uses to which the compoundis to be applied. For general purposes, however, I prefer to employ theingredients in the following propor- 0 tions, to wit: kaolin, tenpounds; plaster-ofparis, twenty pounds; soapstone, ten pounds; jute, onepound; caustic alkali, six ounces; litharge, four pounds; greencopperas, ten pounds; carbolic acid, one pint; liquor ammonite, onepint; dextrine, tenpounds.

In preparingthe composition I first make a solution in one hundredgallons of water of caustic alkali, copperas, carbolic acid, ammonia,and dextrine in proportions named,

and mix the other ingredients therewith, forming a compound whichreadily sets andhardens and which is extremely strong and durable, andwhich is applicable to various structures and other purposes.

My improved compound may be employed in the same manner as the ordinaryplastic compounds used for thepurposes above mentioned but when employedas a pavement or flooring I prefer to lay it in a solid mass and toperforate it at intervals, so as to enable it to give when subjected tothe action of frost or heat, and also to provide for ornamentation byfilling the perforations with the compound differently colored than themass forming the body of the pavement or floor. In order to convenientlyand uniformly efi'ect this purpose I make use of the apparatus ordevices illustrated in the accompanying drawings, in which Figure 1represents a perspective view of my improved device Fig. 2, a verticalsectional View thereof; and Fig. 3, a perspective view of a modificationof my device.

The letter A indicates a slab of metal or other suitable material,perferably of cast iron,

however, and provided on oneside at suitable intervals with suitableangular tapering projections B, and on the opposite side with knobs orhemispherical projections C, as indicated in Figs. 1 and 2 of thedrawings;

In the modification shown in Fig. 3, the de vice consists of a cruciformpiece of metal having tapering angular projections at the ends, and anopening at the center.

In using my improved device, as above described, the pavement orflooring is laid in mass and allow to set, but before hardening thedevice is applied, the conical projections being forced into it, so asto form apertures, which may be afterward filled with the compositiondifferently colored, so as to form suitable ornaments, or when. it isnot desired a to form the angular apertures the device may be inverted,so as to impress the surface by means of the knobs forming hemisphericalrecesses, which may be afterward filledas before men tioued.

Havin g thus described my invention, what I claim, and desire to secureby Letters Patent,

The compound herein described, for architectural and other purposes,composed of kaolin, plaster-of-paris, soapstone, jute, caustic alkali,litharge, green copperas, carbolic acid, liquid ammoniee, and dextrinematter, in the proportions and combined substantially as herein setforth.

In testimony whereof I affix my signature, in presence of two witnesses,this 17th day of October, 1882,

JAMES H. THOBP. Witnesses:

J. J. MCCARTHY, WM. ALEXANDER.

